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Attached is the image of my junction box. Both the orange wires from the valves go into the same connection and have one brown wire in the same block. (5th from the top) The brown wire goes into the floor. I have tried to compare the box with a standard S plan diagram but can't seem to get it...

I have a problem with the boiler in the house. Even with the timer set to off, it comes on and indicates a call for heat. The pipes that get warm appear to be the one to the hot water tank. The problem used to be intermittent but now appears more permanent and I've tried some diagnostics from...

Well the system has not played up so far this week. However I separated out the two orange motor valve leads and the single grey wire that they connect to. Since i think this is an s plan wiring i would have thought that there would be two wires, one for the pump and one for the boiler but there...

This is what the junction box looks like. Which one is the neutral in this context. Happy to rewire to seperate out the orange wires for the valves. The system is working at the moment so will need to wait untill the fault appear again to see if its the valve.

And to add a little test. When i turn the room thermostat up the valve on the ch system does make a noise. Same when i turn up the thermostat on the central heating tank. Does that suggest at the moment both are working? Or since its intermittent does that not tell me anything (timer was set to...

Ok, thought that would be simple but..... Taken the cover off the motorised valves and the terminals are difficult to get to. There is a small cover on it and no obvious place to connect the negative probe. Taken the cover off the junction box too and all orange wires go to one terminal...

I have an Icos HE15 boiler that occasionally comes on when the timer is set to off. It doesn't happen all the time. There is a timer system that allows HW and CH to be separately switched but I can't set separate times. It is set to come on in the morning and the evening but off during...

Replaced the detector electrode. Problem does not seem to have gone away and if anything its more unreliable than before. Any ideas on what to change next ?

Flushed two litres of water down and no problem, the water went down the pipe without any apparent blockage. Repeated and still no problem. Turned to boiler back on, set it to warm, it all fired up and when it shut down after twenty mins it it failed to relight when called again. I think it may...

Thanks for the suggestions. I'll try and look at the condensate pipe but its buried in the wall and not sure where it terminates. Guess flushing down some water will tell ? Then I'll try a new detection electrode.

My ideal ICOS HE15 boiler keeps coming up with a flame error when set to a boiler temperature above mid way. When set low it never (well once actually) comes up with the failure. The boiler has been serviced recently and had the spark electrode replaced and that did not cure the problem. The...